SISTEMA DI RILEVAZIONE DI ONDE ACUSTICHE IN MARE

摘要

System for the detection of acoustic waves in the sea comprising the following units configured to be housed on board a sea vessel: a source (4) of an optical fibre cable without coating; a writing device (7) receiving as input the optical fibre cable and generating as output a processed optical fibre curtain (5w) on which a plurality of Bragg optical sensors (9) are provided spaced from one another; a coating device (13) adapted to coat the portion of each sensor with at least one layer of polymer with low elastic modulus (17) in order to improve the sensitivity of the sensor to the hydrostatic pressure by modifying the original resonance wavelength »B of the refractive grating towards a shifted wavelength »B-sh; a polymerization device (20) for polymerizing the sensor coating; and a deployment device (20) carried by the sea vessel and adapted to release the optical fibre acoustic curtain into the sea.